Stop motion device for a textile machine



April 14, 1959 H. M. MILLER 7 2,881,982

7 STOP MOTION DEVICE FOR A TEXTILE MACHINE Filed April l5, 1957 2 Sheets-Sheet l INVENTOR.

HAROLD M. MILLER.

. QKWWW ATT'Y.

April 14, 1959 H. M. MILLER 2,881,982

STOP MOTION. DEVICE FOR A TEXTILE MACHINE Filed April 15, 1957 2 Shets-Sheet 2 INVENTQR. HAROLD M. MILLER.

2,881,982 s'ror MOTION DEVICE FOR A TEXTILE MACHINE Harold M. Miller, Northbridge, Mass., assignor to Machine Works, Whitinsville, Mass., a corporation of Massachusetts Application April 15, 1957', Serial No. 652,789

1 Claim. (Cl. 242-36) This invention relates to a stop motion device for a textile machine, such as a spool winding machine, in which one or more threads are drawn from a creel or other source of supply and are wound on a suitable spool or bobbin.

It is the general object of the present invention to provide means for stopping the machine on the occurrence of a slub, knot or other enlargement in one or more of the textile threads as they are drawn through the machine. The improved stop motion device commonly operates to stop the machine without breaking the defective thread.

A further object of the invention is to provide a stop motion device which can be easily and accurately adjusted in accordance with thread size or thickness. A still further object is to provide a stop motion device of the type described which is simple in construction, reliable in operation, sensitive yet positive in action, and quickly and easily reset.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly set forth in the appended claims.

A preferred form of the invention is shown in the drawings, in which Fig. 1 is a front elevation of the improved stop mo- 'tion device;

Fig. 2 is a sectional side elevation, taken along the irregular line 22 in Fig. 1;

Fig. 3 is a sectional plan view, taken along the line 3-3 of Fig. 1;

Fig. 4 is a front elevation with the cover removed and taken substantially along the line 4-4 in Fig. 3;

Fig. 5 is a front elevation of certain parts appearing in Fig. 4 but in a different operative relation; and

Fig. 6 is a diagrammatic view of certain electrical connections to be described.

Referring to the drawings, the improved stop motion device'is shown as mounted on a stand or bracket 10 fixed on a creel rod or other fixed support 11. The threads or strands of yarn Y are drawn from a suitable creel or other supply (not shown) and pass over fixed guide-rods 12 and 14 (Fig. 1). They may be drawn through drop wires 15 which abut a fixed cross-rod 16 and which will drop and actuate certain additional stopping mechanism in the event of breakage of one or more of the threads or yarns Y.

This additional stopping mechanism forms no part of the present invention, which relates specifically to means for stopping the machine on the occurrence of a slub, knot, or other enlargement in a thread or yarn and prior to any breakage thereof.

More specifically, the invention relates to a stop motion device comprising a casing 20 (Fig. 3) having a cover plate 21. A stud 22 is fixed in one end of the casing 20 and is angularly adjustable in a bracket 24 which in turn is freely pivoted on a stud 25 in the bracket 10. A nut 27 is provided on the stud 22 to maintain the adjusted angular relation of the body 20 to the arm 24.

I A shaft 30 is mounted in bearings in the casing 20 and in the cover plate 21, and a notched disc 32 '(Fig. 4) is fixed thereon within the casing.

Arms 34 and 35 (Fig. 2) are mounted on the shaft 30 outside of'the cover plate 21, and these arms support a swinging blade 40. A spring 42 on the shaft 30 acts to or stand 10. The upper surface'of the block50 is,

swing the blade 40 against a fixed stop pin or abutment 44 (Fig. 1).

An outwardly-projecting block 50 (Fig. 2) has a threaded end or stud secured by a nut 51 to the bracket straight and flat and rather closely underlies the edge of theblade'40 as shown in Fig. 2 when the blade 40 abuts the stop pin 44.

The free end of the, casing 20rests on an adjusting screw-55 (Fig. 2) by'which it may be raised or lowered to increase or decrease the width of the slot between the blade 40 and the block 50, and to conform the slot with the diameter of the thread or yarn pass therethrough.

A pawl 60 (Fig. 4) is mounted on a cross-rod 61 having suitable hearings in the casing 20 and in the cover plate 21. A spring 62 (Fig. 3) on the rod 61 acts to swing the pawl 60 clockwise and into engagement with the periphery of the notched disc 32.

A yieldable spring plate 64 (Fig. 4) is carried by the pawl 60 and is positioned to engage a contact stud 70 when the pawl 60 is released by clockwise movement of the disc 32. The contact stud 70 is mounted in insulated bushings 72 (Fig. 3) and at its outer end is connected to a line wire L. A reset lever or handle 75 (Fig. 3) is secured to the outer end of the shaft 61 which supports the pawl 60.

In the operation of the device, the engagement of a slub or knot S (Fig. 1) with the blade 40 causes the blade to be swung clockwise and to move the disc 32 (Fig. 4) likewise clockwise to free the pawl 60. The pawl thereupon drops as shown in Fig. 5 to bring the plate 64 into engagement with the insulated stud 70 and to thus complete a grounded circuit through the stop motion device. When this circuit is thus closed by the positioning of the pawl 60 in the notch of the disc 32, the machine will be immediately stopped by any suitable electrical stopping mechanism.

One such mechanism is shown diagrammatically in Fig. 6, in which the swinging of the detector plate 64 downward against the stud 70 closes an indicating circuit through a relay and thereby energizes a solenoid 82 which closes a switch 84 in the power line L of a circuit L which controls any suitable stopping or knock-off mechanism, as K (Fig. 6).-

When initially setting-up the stop motion for use, the nut 27 (Fig. l) on the stud 22 is first loosened, and the stud 22 and casing 20 are then shifted angularly about the axis of the stud 22 to bring the movable blade 40 into parallel relation with the block 50 as shown in Fig. 2. This may be most easily done by loosening the adjusting screw 55 to allow the blade 40 to move down and rest directly on the block 50.

The nut 27 is then tightened to maintain said parallel relation, and the screw 55 is turned to raise the casing and blade to produce the desired clearance between the blade 40 and the block 50 for the kind and size of thread or yarn Y to be drawn therethrough.

The device is shown in operative position in Fig. 4. Engagement of a slub or knot S with the yieldable swinging blade 40 will shift the disc 32 clockwise relative to the pawl 60, so that the pawl will drop into the notch in the disc. The spring plate 64 will then engage the insulated stud 70 and will complete the relay circuit, as 80 (Fig. 6), to activate the solenoid 82 to stop the machine.

As the blade 40 swings quite freely when engaged by a Patented Apr. 14, 1959 slub-or knot S, there is no interference with the continued travel of the thread or yarn Y, and the thread oryarn is commonly notbroken by the operation of the stop motion device. Such breakage does occur in certain stop motion-devices previously in use.

'Whenia defectivethread oryarn'has been-repaired and the slu-b or enlargement removed the device may be reset bymerely depressingthe handle '75 and thus lifting the pawl 60, which in turn releases the disc 32 and thus allows the blade to swing back to its normal upright positiom Having thus described my invention and the advantages thereof, 1 do not wish to be limited to the details herein disclosed, otherwise. than as set forth in the claim, but what I claim is:

'Ina textile machine, a-stop motion device comprising a fixed detecting unit formed as a blockhaving anextended'flat yarn-supporting upper surface, a movable-detecting member mounted to swing freely in spaced relation to said fixed unit and comprisinga pivoted elongated straight blade uniformly spaced from said extended-.flat

surface of said fixed detecting unit, a notched disc mounted to rotate with said movable detecting member, means to guide the yarn between said units, machine-stopping mechanism, and means to activate said machine-stopping mech anism when any enlargement of said yarn causes displacement of said movable detecting unit, and said machinestopping mechanism being electrically activated and comprising a circuit-closing member supported in inoperative positionby saidnotched disc mOUHtCd-tOTIOIfltGWith the movable detecting member, and said circuit-closing member becoming operative when it is dropped-into thenotch" of'said discon' rotary displacement'of saididisc.

References Cited in the .fileof' thispatent UNITED ISTATES PATENTS 1,905,259 Abbott Apr. 25, 1933 2,133,711 McAllister et a1 Oct. 18, 1938 2,572,837 Brink Oct. 30, 1951 

